[Samba] filtering user files

[Lillig Joachim]

> I think that the "hide dot files" directive should actually 
> prevent the 
> user from seeing or interacting with these file in their account.
> 

Another reason to not show dot files is interaction with netatalk.
Netatalk creates dot directories to store the resource forks when
simulating Apple file systems.
Users should not see or modify them.

Joachim Lillig