Comment 5 for bug 1580237

Hi,

Just try to see if this fixes:
* Upgrade to the latest version (on 14.04, 4.3.9);
* Add to /etc/samba/smb.conf file in the [global] section on the client:
    winbind expand groups = 1
* Restart smbd, nmbd and winbind

Fixed your same issue. sgrp seems to mount right after this procedure.