Samba User permissions

I m trying to setup custom User permissions for a certain
user on my samba server. What i try to achieve is to login with mentioned user, lets say
its name is user1, and only access two folders folder1, and folder2(with rwx
permissions). The share contains plenty of other folders,which he should NOT see them.

All my samba users are part of a group, lets say its called
staff.

My global config is this
:

[global]

log
            file = /var/log/samba/log.%m 
load printers = no 
socket options =
            TCP_NODELAY 
full_auditrefix = %u|%T|%m|%S 
full_audit:facility =
            local5 
interfaces = 192.168.0.20/255.255.255.0 
passdb backend =
            tdbsam 
allow hosts = 127. 192.168.0. 192.168.3. 
unix extensions =
            no 
cups options = raw 

vfs objects = full_audit
            
full_audit:success = connect disconnect mkdir rmdir write sendfile rename
            unlink chmod fchmod chown fchown 
full_auditriority = notice
            
workgroup = MYSERVER 
full_audit:failure = connect 
use
            sendfile = yes 
security = user 
max log size = 50
            

The shared
directory config :

[share]
            
writeable = yes 
path = /home/share
vfs object =
            full_audit 
comment = Linux 
valid users = user1,user2,user3
            
create mode = 0660 
directory mode = 0770
            

With this
configuration user1 can login and see all the files and folders. (which is not my
purpose)

If i erase user1 from the staff group,
and set the mentioned folder1, folder2 with the permissions of 777, the user wont have
permission to access the server. I just tested it.

So my question is how can i provide for the
user accessibility to the share, but restriction to those folders only?

The mentioned shares permissions are:

drwxrwxr-- 28 root
            staff 4.0K Jan 30 16:22 share