[Zope] refering to the id of the enclosing folder in a tree tag

[Lucas Hofman]

If I have a folder structure like this

a
  a1
  a2
  a3
b

etc.

Using a treetag to traverse this how can I refer to the id of the
enclosing folder (that is the folder dat contains the 'current' element?

I tried this:
<dtml-tree reports
        branches_expr="objectValues(['Folder'])" 
        >
    <dtml-var "PARENTS[0].id"> <dtml-var id>
</dtml-tree>

but that gives the id of the folder containing the method which contains
this DTML snippet. 

Any suggestions?

Thanks, Lucas
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