Are there any tools that can run (even across network on another box) to analyze possible duplication at various block sizes? I am NOT interested in finding du

Are there any tools that can run (even across network on another box) to analyze possible duplication at various block sizes? I am NOT interested in finding duplicate files, but duplicate slices within all my files overall. I can easily throw together code myself to find duplicate files. EDIT: I guess I’m looking for a ZFS/BTRFS/other dedupe preview tool that would say “you might save this much if you used this dedupe process.”