pysmbで共有フォルダ配下のパスにアクセスできない

Question

お世話になります。
pysmbを用いてubuntuからwindowsの共有フォルダの配下にアクセスしたいのですが、
共有フォルダまでしかアクセスできません。
デバッグ方法、アドバイス等ご教示いただけると幸いです。

環境

サーバー
ubuntu 18.01
python 3.7.1
pysmb 1.2.6

クライアント
Windows Server 2012R2

import platform
from smb.SMBConnection import SMBConnection

user = "administrator"
pwd = "password"
hostname = "WINFS"
domainname = "DOMAIN"
ipadress = "ipaddress"
target = "path/to/folder"

conn = SMBConnection(
    user,
    pwd,
    platform.uname().node,
    hostname,
    domainname,
    is_direct_tcp=True
    )

def conn_WINFS():
    conn.connect(ipaddress,445)
    # ここで接続先との疎通は確認してます
    print(conn.echo("echo success"))

目的のフォルダまでのアクセスについては次の通り記述しています。
まず、共有フォルダまでは接続できます。

    items = conn.listPath('share', '')
    print([item.filename for item in items])
    # echo success
    # ['.', '..', 'path']

しかしながら、ターゲットまでのパスを追加するとエラーになります。

    items = conn.listPath('share', target)
    print([item.filename for item in items])

エラーメッセージは次の通りです。

echo success
Traceback (most recent call last):
  File "/home/username/app/myspace/scripts/smbs.py", line 27, in <module>
    conn_coopfs1()
  File "/home/username/app/myspace/scripts/smbs.py", line 17, in conn_coopfs1
    items = conn.listPath('share', 'target')
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/SMBConnection.py", line 203, in listPath
    self._pollForNetBIOSPacket(timeout)
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/SMBConnection.py", line 637, in _pollForNetBIOSPacket
    self.feedData(data)
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/nmb/base.py", line 54, in feedData
    self._processNMBSessionPacket(self.data_nmb)
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/nmb/base.py", line 75, in _processNMBSessionPacket
    self.onNMBSessionMessage(packet.flags, packet.data)
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/base.py", line 144, in onNMBSessionMessage
    if self._updateState(self.smb_message):
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/base.py", line 338, in _updateState_SMB2
    req.callback(message, **req.kwargs)
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/base.py", line 642, in createCB
    errback(OperationFailure('Failed to list %s on %s: Unable to open directory' % ( path, service_name ), messages_history))
  File "/home/username/.pyenv/versions/3.7.1/lib/python3.7/site-packages/smb/SMBConnection.py", line 197, in eb
    raise failure
smb.smb_structs.OperationFailure: Failed to list path/to/folder on share: Unable to open directory
==================== SMB Message 0 ====================
SMB Header:
-----------
Command: 0x03 (SMB2_COM_TREE_CONNECT) 
Status: 0x00000000 
Flags: 0x00 
PID: 32643 
MID: 4 
TID: 0 
Data: 40 bytes 
b'09000000480020005c005c0043004f004f0050002d004600530031005c0073006800610072006500' 
SMB Data Packet (hex):
----------------------
b'fe534d4240000000000000000300000000000000000000000400000000000000837f000000000000950a0078001c01000000000000000000000000000000000009000000480020005c005c0043004f004f0050002d004600530031005c0073006800610072006500'
==================== SMB Message 1 ====================
SMB Header:
-----------
Command: 0x03 (SMB2_COM_TREE_CONNECT) 
Status: 0x00000000 
Flags: 0x01 
PID: 32643 
MID: 4 
TID: 1 
Data: 16 bytes 
b'100001000300000008000000a9001200' 
SMB Data Packet (hex):
----------------------
b'fe534d4240000000000000000300010001000000000000000400000000000000837f000001000000950a0078001c010000000000000000000000000000000000100001000300000008000000a9001200'
==================== SMB Message 2 ====================
SMB Header:
-----------
Command: 0x05 (SMB2_COM_CREATE) 
Status: 0x00000000 
Flags: 0x00 
PID: 32643 
MID: 5 
TID: 1 
Data: 152 bytes 
b'39000000020000000000000000000000000000000000000089001000000000000700000001000000010000007800080080000000580000001f7554532c67e8902800000010000400000018001000000044486e510000000000000000000000000000000000000000180000001000040000001800000000004d78416300000000000000001000040000001800000000005146696400000000' 
SMB Data Packet (hex):
----------------------
b'fe534d4240000000000000000500000000000000000000000500000000000000837f000001000000950a0078001c01000000000000000000000000000000000039000000020000000000000000000000000000000000000089001000000000000700000001000000010000007800080080000000580000001f7554532c67e8902800000010000400000018001000000044486e510000000000000000000000000000000000000000180000001000040000001800000000004d78416300000000000000001000040000001800000000005146696400000000'
==================== SMB Message 3 ====================
SMB Header:
-----------
Command: 0x05 (SMB2_COM_CREATE) 
Status: 0xC0000257 
Flags: 0x01 
PID: 32643 
MID: 5 
TID: 1 
Data: 9 bytes 
b'090000000000000000' 
SMB Data Packet (hex):
----------------------
b'fe534d4240000000570200c00500010001000000000000000500000000000000837f000001000000950a0078001c010000000000000000000000000000000000090000000000000000'

以上です。
よろしくお願いいたします。

Answer 1

後出しのようで申し訳ないのですが、接続先のフォルダはDFS配下にあります。
pysmbはDFSに対応していないようなので、別のやり方を模索することにしました。
https://github.com/miketeo/pysmb/issues/121