[O] finding a parent node

[Łukasz Stelmach]

Hello All.

What is the best way to iterate over ((great)*grand)?parent headlines of
the current one (at point), that meets some criteria.

--8<---------------cut here---------------start------------->8---
* Projects
  I am working on.

** Project for Mondays

*** tasks

*** resources

** Project for the rest of the week

*** tasks                        :TASKS:
^                      <------ (3) I'd like it to move here
    If I do this stuff I will rule the world.
                             ^       <----- (2) or it may be here.
**** TODO do this                  

**** TODO do that                  
     I am trying.
                 ^     <------ (1) point is here
**** TODO WAT?

*** resources
--8<---------------cut here---------------end--------------->8---

With my point somewher deep I'like to find the closest parent heading
tagged :TASKS:.

If that helps, I'd like to export the subtree of the heading I find by
simply running the export function at any point of the subtree.

Kind regards,
-- 
Łukasz Stelmach
Samsung R&D Institute Poland
Samsung Electronics