dst := m.o[:0]
	for _, o := range m.o {
		if !o.isDir() {
			dst = append(dst, o)
		}
	}
	m.o = dst
}

// filterPrefixesOnly will remove objects.
// Order is preserved, but the underlying slice is modified.
func (m *metaCacheEntriesSorted) filterPrefixesOnly() {
	dst := m.o[:0]
	for _, o := range m.o {
		if o.isDir() {
			dst = append(dst, o)
		}
	}
	m.o = dst
}