2.5.11 and smbfs
the same problem here (2.5.12+fb patch).
dmesg says:
smb_retry: successful, new pid=427, generation=2smb_request: result -104, setting invalidsmb_retry: successful, new pid=430, generation=2smb_proc_readdir_long: name=\, result=-2, rcls=1, err=2