sculpt mode face set falloff

when using the mesh filter set to smooth, on an area defined by a face set, there's a very harsh edge between the smoothed area and the area outside of the face set.

I suggest a face set falloff option which can be set to either inner or outer. Inner will reduce the effect of the brush before it reaches the face set border. Outer will reduce the brush strength beyond the face set border. The distance of the falloff could be defined by a ramp in combination with a distance in world units.