[Samba] default backend = rid not showing full group information for users

[miguel medalha]

> I am trying to use the backend = rid but it is not showing me group 
> information of the users after adding the user to the domain groups...

> root at samba01:~# id jdoe
> root at samba01:~# id lgaga

What are your entries for 'passwd' and 'group' in '/etc/nsswitch.conf'? I
suppose winbind should be there. In my case:

passwd:     files winbind
group:      files winbind