Tree Based Permissions

I want to be able to control access to items.  The items will be organized via a tree.  I want to be able to give permission to various branches of the item tree to groups who will also be organized in a tree.  I took a look at the built in ACL method but it looks like it is limits to restricting access based on controller actions.  e.g. You could give a group access to add a post, site.com/posts/add or a group could delete posts site.com/posts/delete.  But what if I want to let group A add/edit/delete items in branch X of the tree and group B add/edit/delete in branch Y. 

I could write my own code but I hate reinventing the wheel.

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