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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def list_mount():
    '''
    List mounted zfs filesystems

    .. versionadded:: 2018.3.1

    CLI Example:

    .. code-block:: bash

        salt '*' zfs.list_mount

    '''
    ## List mounted filesystem
    res = __salt__['cmd.run_all'](
        __utils__['zfs.zfs_command'](
            command='mount',
        ),
        python_shell=False,
    )

    if res['retcode'] == 0:
        ret = OrderedDict()
        for mount in res['stdout'].splitlines():
            mount = mount.split()
            ret[mount[0]] = mount[-1]
        return ret
    else:
        return __utils__['zfs.parse_command_result'](res)