How use ACL in a particular situation

Hi
I have a design question on ACL that I would use in my system.
The problem is my system is a bit different from standard.
I have users that can be belong to many teams.
So a user can belong to two,three,four etc... teams.
Moreover I have to manage the access of users to a document's list.
To do this i would do this with ACL because I have to manage
permissions for access to documents.
M question is how define the ARO tree since I have user that belong to
many teams (sometimes the permissions for access to documents are
defined by teams, exactly If a user belongs to a team that can't read
a document and belongs to a team that can read a document the user can
read the document)?
How is parentNode() function in user model?
Many Thanks
Marco

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