Show information of a given subvolume

    path
        Mount point for the filesystem

    CLI Example:

    .. code-block:: bash

        salt '*' btrfs.subvolume_show /var/volumes/tmp

def subvolume_show(path):
    '''
    Show information of a given subvolume

    path
        Mount point for the filesystem

    CLI Example:

    .. code-block:: bash

        salt '*' btrfs.subvolume_show /var/volumes/tmp

    '''
    cmd = ['btrfs', 'subvolume', 'show', path]

    res = __salt__['cmd.run_all'](cmd)
    salt.utils.fsutils._verify_run(res)

    result = {}
    table = {}
    # The real name is the first line, later there is a table of
    # values separated with colon.
    stdout = res['stdout'].splitlines()
    key = stdout.pop(0)
    result[key.strip()] = table

    for line in stdout:
        key, value = line.split(':', 1)
        table[key.lower().strip()] = value.strip()
    return result