∀ {F : Type u_1} {α : Type u_2} {β : Type u_3} [inst : MulOneClass α] [inst_1 : MulOneClass β] [inst_2 : FunLike F α β]
  [MulHomClass F α β] (m : F) {f g : Filter β}, Filter.comap (⇑m) f * Filter.comap (⇑m) g ≤ Filter.comap (⇑m) (f * g)