Short answer – none!
Just so I’m clear about the requirement…
When you document a Package, you can set the initial heading level he zero, which suppresses any detail of the top-level package, and just documents its immediate children as H1.
You’d like to do the same for an Element. So, no details of the top-level element will document, just details about it’s children. This also means any diagrams which are children of the top-level element also will NOT be printable.
Have I got this right ?