Option: -noleaf
Do not optimize by assuming that directories contain 2 fewer subdirectories than their hard link count.
This option is needed when searching filesystems that do not follow the Unix directory-link convention,
such as CD-ROM or MS-DOS filesystems or AFS volume mount points.
Each directory on a normal Unix filesystem has at least 2 hard links: its name and its . entry.
Additionally, its subdirectories (if any) each have a .. entry linked to that directory.
When find is examining a directory,
after it has statted 2 fewer subdirectories than the directory’s link count,
it knows that the rest of the entries in the directory are non-directories (leaf files in the directory tree).
If only the files’ names need to be examined,
there is no need to stat them; this gives a significant increase in search speed.
refer: https://www.gnu.org/software/findutils/manual/html_node/find_html/Directories.html