[Samba] ldap samba attributes will automatically add

[qwerty]

Hi List,

I'm running samba with ldapsam.With LDAP samba
schema(sambaSamAccount),the required attributes are only sambaSID and
uid.I use some attributes for my basic settings,but it seems that when
connecting to samba server from other PCs ,it will automatically add
other attributes(I think those are useless)

my initial attributes(about samba)
------------
sambaSID
sambaPrimaryGroupSID
sambaLMPassword
sambaNTPassword
sambaAcctFlags

add automatically by samba server
--------------------------
sambaPwdCanChange
sambaPwdMustChange
sambaPasswordHistory
sambaPwdLastSet

Q:
Why the samba server is doning that?Is that necessary?Can I make some
changes to avoid this behavior?

Thanks