[Samba] SMB3.0 with XP Home and Win98SE clients. XP no go, what should I do?

[Apollo at Carmel Music & Entertainment]

I want to have SMB server to authenticate all my users. Problem is that 
I have 8 Win98SE workstations and 2 XP Home laptops. I know XP Home 
won't do domain log-ons. What are my options (I would realy hate giving 
M$ more money by upgrading laptops to PRO)?
How can I do user based log-ins in that kind of environment?

Thanks,
Apollo