The filter is based on filename so it would only show results if there are files with 'images' in their name. There's no filter on file type at the moment, although it'll likely be added at some stage.
Ok I understand, only for not logical if I am looking for a photo folder and finds it without a problem but after clicking on the folder I have it empty, then it should behave as if without the use of a filter it will simply open its contents.