[Zope] Accsessing the folder above

[Sebastian Queißer]

Hi!

I'm trying to display all folders in the folder above my
product(derived from a folder) in a tree. It must be something like this:

<dtml-tree branches_expr="Subfolder.objectValues(['Folder'])">
...
</dtml-tree>

The problem is, that this doesn't work. I search something for
"Subfolder", which includes the folder above.
It works with the name of the Folder, but I want to use the product in
every folder without changing it every time.

Thanks
Sebastian