CIFS sharing folders

Hello,

I have some issue with CIFS sharing folders
In fact I'd like:
2 users : user1 et user2
2 datasets : folder1 et folder2

and for sharing rights I'd apply:
user1 must access to folder1 and folder2 in RWX (can modify all files)
user2 must access to folder2 in RWX (can modify all files) and no access to folder1
and I don't want use guest access

It'look easy but have many troubles with readonly access..
Here is my...

CIFS sharing folders