How to recursively copy a remote directory from SMB 3.x to a local directory on Linux Host, using pysmb

I am using smb.SMBConnection from pysmb package to fetch files from Share hosted on Windows to Linux Host. Script is run on Linux and it works with simple files like follows:

from smb.SMBConnection import SMBConnection

conn = SMBConnection(
    username, password, server, domain, use_ntlm_v2=True,
    sign_options=SMBConnection.SIGN_WHEN_SUPPORTED,
    is_direct_tcp=True
)
conn.connect(server, 445)

file_attributes, filesize = conn.retrieveFile(share_name + "/" + filename, local_file)

Is there a way to make this code work, when filename and local_file are directories?

Just attempting the same code on directory will plainly fail:

File "/usr/lib/python3.6/site-packages/smb/SMBConnection.py", line 341, in eb
    raise failure
smb.smb_structs.OperationFailure: Failed to retrieve  on 1.7.3: Unable to open file
==================== SMB Message 0 ====================
SMB Header:
-----------
Command: 0x03 (SMB2_COM_TREE_CONNECT) 
Status: 0x00000000 
Flags: 0x08 
PID: 12815 
MID: 3 
TID: 0 
Data: 42 bytes 
b'09...' 
SMB Data Packet (hex):
----------------------
b'fe5...'

How to fetch entire directory (rather than single file) from Windows Share to Linux Host, using Python?