[Samba] Permissions problem

[Nick Thorley]

I have setup samba and also winbind and have joined an active directory. 
  That part as worked and i can see domain users etc connected and the 
samba machine can list domain users.  However when i right click on a 
folder in windows and then select permissions then the option to select 
domain users is greyed out and it is defaulted to the samba machine 
users.  Please could someone tell me how i can select domain users to 
give more people access to the folder.

Thanks