[Samba] problem giving setting user permissions on specific folder

[Alberto Valdes Gonzalez]

Hello:

I have this user who should have read write permissions in the folders

\\server/folder1/folder2

\\server/folder4

Using windows I set the permission for this user but it does not work. I 
can not access the folders

If I try

server ~ # smbclient //server/folder1 -U username
Enter username's password:
Domain=[INTERN] OS=[Unix] Server=[Samba 3.6.23]
tree connect failed: NT_STATUS_ACCESS_DENIED

i get that.

Can anyone please help me?

Thanks

Alberto