Originally Posted by Android_808

How about:

Create a GFile

Code:

GFile *
g_file_new_for_path (const char *path);

Get the enclosing mount for that GFile

Code:

GMount *
g_file_find_enclosing_mount (GFile *file,
                             GCancellable *cancellable,
                             GError **error);

or

Code:

void
g_file_find_enclosing_mount_async (GFile *file,
                                   int io_priority,
                                   GCancellable *cancellable,
                                   GAsyncReadyCallback callback,
                                   gpointer user_data);

Then get the volume from the mount

Code:

GVolume *
g_mount_get_volume (GMount *mount);