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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 subvolume_get_default(path):
    '''
    Get the default subvolume of the filesystem path

    path
        Mount point for the subvolume

    CLI Example:

    .. code-block:: bash

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

    '''
    cmd = ['btrfs', 'subvolume', 'get-default', path]

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

    line = res['stdout'].strip()
    # The ID is the second parameter, and the name the last one, or
    # '(FS_TREE)'
    #
    # When the default one is set:
    # ID 5 (FS_TREE)
    #
    # When we manually set a different one (var):
    # ID 257 gen 8 top level 5 path var
    #
    id_ = line.split()[1]
    name = line.split()[-1]
    return {
        'id': id_,
        'name': name,
    }