How do you get interpolation weights from griddedInterpolant?

Hi, I have a griddedInterpolant object F, and I can query it with a set of points v to get the interpolated values:

   F = griddedInterpolant(...);
   values = F(v);

However, I want to know how the griddedInterpolant achieved these values; I want to find the set of points and weightings used to interpolate the results. Is there a way to do this with the F object or any other ideas?

Thanks.