samba - Dec 2007 - Accessing a samba share with authentication in a external LDAP server

I am running a samba server 3.0.* and I want users to be authenticated in a
external LDAP server on which I have no administrator privileges. The users
would be added to the system by means of the adduser command.

I have been reading lots of manuals and docs on the internet but the more I
read the more I get confused. 

What are the minimum lines I need to include in smb.conf for it to work?

Let us suppose that the parameters to access the LDAP server are:

The LDAP RDN, used to bind to the server:
uid=%s,ou=People,dc=subdom,dc=dominio,dc=es

Base DN:
dc=subdom,dc=dominio,dc=es

Search filter:
uid=%s


Any help would be very welcome.

Regards,

Rafa Gallego