Fun fact: PATH_MAX and FILE_MAX are glibc/muslc limitations. The Linux Kernel doesn't have a limit here and will happily let you walk into a directory with a 2G

Fun fact: PATH_MAX and FILE_MAX are glibc/muslc limitations. The Linux Kernel doesn't have a limit here and will happily let you walk into a directory with a 2GB pathname. ext4 doesn't limit directory depth; only filename length. A filename can be 255 bytes in ext4. How deep that lies in the filesystem isn't limited. btrfs has the same filename limit, no underlying limit on directory depth. And I would most likely guess most filesystems don't because the obvious ways to implement directories don't place limits on that depth.