"william":    {Data: []byte("Shakespeare\n")},
		"carl":       {Data: []byte("Gauss\n")},
		"daVinci":    {Data: []byte("Leonardo\n")},
		"einstein":   {Data: []byte("Albert\n")},
		"dir/newton": {Data: []byte("Sir Isaac\n")},
	}
	tmpDir = t.TempDir()
	if err := CopyFS(tmpDir, fsys); err != nil {
		t.Fatal("CopyFS:", err)
	}
	forceMFTUpdateOnWindows(t, tmpDir)
	tmpFsys = DirFS(tmpDir)

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