ZFS can support normalization also:

    $ echo test > $'\xc3\xb6'
    $ cat $'\x6f\xcc\x88'
    cat: ö: No such file or directory

    $ zfs create -o normalization=formD pool/dataset
    $ echo test > $'\xc3\xb6'
    $ cat $'\x6f\xcc\x88'
    test