func New(namespaces ...string) Store {
	s := newStore(namespaces...)
	s.clock = clockwork.NewRealClock()
	return s
}
func New(namespaces ...string) Store {
	s := newStore(namespaces...)
	s.clock = clockwork.NewRealClock()
	return s
}
// New creates a store where the given namespaces will be created as initial directories.