Samba Homes Directory Security Problem

[ppawcio]

Hi I have successfully joined Linux Red Hat Samba to Active Directory Domain and then I have set up home directories. The configuration is attached:

Everything works fine but here is a security problem.
user1 can access home share for user2 when browsing through windows netbios as in:

To win XP i log in as user1, the share for user1 is accessible when i browse in to
fileserver\user1 but the same user1 can also browse to
fileserver\user2 how can i prevent that?