IIRC ln(1) can't create directory hardlinks, but link(2) allows it (on HFS+, directory hardlinks were not ported over to APFS).
Directory hardlink support was originally added for time machine.
IIRC ln(1) can't create directory hardlinks, but link(2) allows it (on HFS+, directory hardlinks were not ported over to APFS).
Directory hardlink support was originally added for time machine.