}{
		{
			name:   "root",
			prefix: "object.ext",
			want:   "",
		},
		{
			name:   "rootdotslash",
			prefix: "./object.ext",
			want:   "",
		},
		{
			name:   "rootslash",
			prefix: "/",
			want:   "",
		},
		{
			name:   "folder",
			prefix: "prefix/",
			want:   "prefix/",
		},
		{
			name:   "folderobj",
			prefix: "prefix/obj.ext",

	}
	return n
}

// root returns the root of the cache.
func (d *dataUsageCache) root() *dataUsageEntry {
	return d.find(d.Info.Name)
}

// rootHash returns the root of the cache.
func (d *dataUsageCache) rootHash() dataUsageHash {
	return hashPath(d.Info.Name)
}

// clone returns a copy of the cache with no references to the existing.
func (d *dataUsageCache) clone() dataUsageCache {