Adding Info To Search Results Page

How can I add a simple column to the search results page that will list the parent forum title in addition to just the forum title?

For instance...
If my forum was setup like this:
MainCatagory1
-Sub1
-Sub2
-Sub3
MainCatagory2
-Sub1
-Sub2
-Sub3

...instead of the search results listing "sub2" as the forum, I'd like it to read "MainCatagory1:Sub2".

Thanks!