Fuel filtering from tank to engine goes from coarse to fine. Normal setup is "boulder" catcher at fuel pickup (kerfs in fuel pickup tube in tank), gascolator (120 micron), and finger screen assembly at carb (my plane). Carb "finger screen" is very fine, (Marvel pn 95-506); I can't find a micron value but it's visibly much finer than the gascolator screen.
So, at first blush it would not make sense to install something finer upstream of the gascolator.