/experimental # getfacl foo/
# file: foo/
# owner: root
# group: wheel
            owner@:rwxp--aARWcCos:------:allow
            group@:r-x---a-R-c--s:------:allow
         everyone@:r-x---a-R-c--s:------:allow
/experimental # setfacl -x0 foo/
/experimental # getfacl foo/
# file: foo/
# owner: root
# group: wheel
            group@:r-x---a-R-c--s:------:allow
         everyone@:r-x---a-R-c--s:------:allow
/experimental # ls -ld foo/
dr-xr-xr-x+ 2 root  wheel  2 Jan 17 16:25 foo/