How could I separate these points so they're grouped by voronoi cell?

I cannot figure out how to select the points that are in a specific cell.

2018.10.10_mcneel_forum.gh (34.8 KB)

Use Trim Tree with depth of two to get all points of a cell, depth of one to retain the ring structure.

2018.10.10_mcneel_forum_re.gh (35.8 KB)

Thank you!