[Vala] How to cancel async GIO DBus method?

[Tal Hadad <tal_hd hotmail com>]

Async GIO method can be canceled by Cancelable.
Is there any way to cancel async DBus method by GIO?

This is the method I may need to cancel:
[DBus (name = "org.freedesktop.DBus")]
internal interface MasterDBus : GLib.Object {
    public abstract async string[] list_names () throws IOError;
}

Thanks,
Tal