Smoothing values of another layer

I have Layer A which has a standard wiggle on it. I pickwhip the position of Layer B to copy Layer A's.

But now I want Layer B's motion to be a damped — as if Layer B is copying Layer A's movement, but Layer B is stuck in molasses.

Can I use the  smooth(width = 1, samples=5, t=time) function to accomplish this? Is there a better way?  How could I also add a slight time delay to Layer B so it's a few frames behind Layer A's motion?