Healing process should not heal root disk (#7089)

pkg/disk/root-disk-windows.go

@@ -0,0 +1,9 @@
+// +build windows
+
+package disk
+
+// IsRootDisk returns if diskPath belongs to root-disk, i.e the disk mounted at "/"
+func IsRootDisk(diskPath string) (bool, error) {
+	// On windows a disk can never be mounted on a subpath.
+	return false, nil
+}