Mantaflow fluids collision upres

I didn’t want to post this on RCS because I don’t know if it is technically possible with Mantaflow.

Would it be possible to have an option to upres the collision resolution without changing the fluid resolution? At first, I thought that the “fractional obstacles” option does that but after testing it, it seems to me like it does an interpolation of the grid which works for some cases but isn’t really a solution to our problems.

With this option (if technically possible), Mantaflow could be better optimized performance-wise.