Ajax basel product filters customize

Hi,

I would like to know if ite possible to customize ajax product filters

Ajax product filters use products attribut.
Is that possible in categories to show only attribut who has products ?

Exemple with jeans catégorie

I don’t have purple Jeans in my categorie.
But I’ve got purple product in another categorie.

With filter I can select purple in Jeans categorie. Of course if I serach filters will find no product.
So I would like that purple is not possible to see if product in that colour doesn’t existe.

Thanks for your help

Regards

Charles