[O] filetags - at certain level

[Richard Riley]

Would it be an easy enhancement to specify the level to apply certain
filetags from the top org file meta data e.g

#+FILETAGS: :crypt#2:private:

In other words the more explicit equivalent would be something like

* Banking
** Deutsche Bank Credit Card    :crypt:visa:
** Maldives Platinum Card       :crypt:visa:
** Barclays EC                  :crypt:ec:

Why? So that only the second level entry contents are encrypted by
default and not their titles : thus enabling tag search for the second
levels. Or third or whatever.

As it is applying a "saftey first" top level filetag of :crypt: means
nothing below banking(first level) can be seem by the tag search.

Thoughts? Or maybe its already possible?