Filter By Item including all dependent Sub-Item

I have create a project-list with items and subitems, like:

Ford

     Fiesta

     Focus

     Mondeo

Citroen

    C1

    C2

   DTS

I want to filter by first level, including all depending subitems, for example if I filter for Citroen, I need the query answer have Citroen, C1, C2 and DTS, but I only receive the items that has establish Citroen.

How can I do to receive the item and all sub items depending data?

Thank you.