Function gio_sys::g_file_find_enclosing_mount_async

pub unsafe extern fn g_file_find_enclosing_mount_async(file: *mut GFile,
                                                       io_priority: c_int,
                                                       cancellable: *mut GCancellable,
                                                       callback: GAsyncReadyCallback,
                                                       user_data: gpointer)