GObject
        GUnixMountMonitor
        GOutputStream
            GFilterOutputStream
                GDataOutputStream
                GBufferedOutputStream
            GUnixOutputStream
            GFileOutputStream
            GMemoryOutputStream
        GInputStream
            GUnixInputStream
            GMemoryInputStream
            GFilterInputStream
                GBufferedInputStream
                    GDataInputStream
            GFileInputStream
        GDesktopAppInfo
        GFileMonitor
        GVfs
        GMountOperation
        GThemedIcon
        GFileEnumerator
        GFilenameCompleter
        GFileIcon
        GVolumeMonitor
        GTypeModule
            GIOModule
        GCancellable
        GSimpleAsyncResult
        GFileInfo
    GInterface
        GIcon
        GSeekable
        GAppInfo
        GVolume
        GAsyncResult
        GLoadableIcon
        GDrive
        GFile
        GMount