UFS, 1 volume: public access + specific users

[zio_mangrovia]

I'm new user for FreeNas 8.3.0 and I'm creating this system for only few Windows XP clients.
I have only 1 volume (UFS) which is mounted on /mnt/Master
I created this environment with these 2 users:

• Tom ('home' group)
• Jerry ('home' group)

Tom and Jerry have the same primary group, which is 'home'
My share path is '/mnt/Master' and it's called 'ShareAccess'

I'd like this behaviour:

- folder 'Public': any user can access (R/W) e.g. (guest, Tom, Jerry, ...)
- folder 'Tom': only users which belong to 'home' group can access (R/W)
- folder 'Jerry': only users which belong to 'home' group can access (R/W)


Users settings:

• I have to create 'guest' account ?
• What 'home directory' I have to set for Tom, Jerry, guest account ? What permissions ?

Volume settings:

• What 'owner' and 'group' I have to assign to volume ?
• What permission ?

Share settings:

• I have to activate 'Allow Guest Access' and 'Only Allow Guest Access' ?

I thought to create public access to "ShareAccess", to create these 3 folder (Tom, Jerry, Public) by my Windows client and assign them the correct rights.
What do you think about my doubt ? Can I create this system without ZFS ?