Problems in Setting ACL in samba 2.2.0

[Kevin]

Dear Author,

I found that there are problems and cannot found any documents on how to add the ACLS on using the smbcacls command, does i need to add the ACL list before assigned it to the files or directly add them to the files?
Please give me a real example,
if i have 3 users group, namely
a) Administrator group
b) Accounting group
c) Worker group
If I have a folder named accounts
How can i assigned the "ACCOUNTS" folder to above 3 groups when
a) administrator group have read and write rights
b) Accounting group only have write rights,
and c)worker group cannot have see the folder "ACCOUNTS" in the drive/

Besides, i also want to ask a question that does i need the password of user when assign a folder's access rights to specific user or just supply the roots' pasasword in order to set the 'SMBCACLS" program??

Thanks for you kind attention,

Regards
Kevin 
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