vfs_fruit: Add capability to advertise FULLSYNC

[github at samba.org]

New comment by Henrik41 on Samba Github repository

https://github.com/samba-team/samba/pull/64#issuecomment-346214078
Comment:
I am a bit disoriented and new at this. I have an Ubuntu 16.04 (LTE) with samba 4.3.11-Ubuntu
I need to install this patch to use samba for my Time machine but don't know where to go from there. Any help is welcome.