Sync file when path is a samba share (on Windows)
Sync file when path is a samba share (on Windows)

(cherry picked from commit 67521d4a804bc04ecab1df93e0ec0511f96342eb)

uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend,uroni/urbackup_backend