fixup: Update cmd/containerd-shim-runhcs-v1/rootfs.go

Co-authored-by: Kathryn Baldauf <kabaldau@microsoft.com>

cmd/containerd-shim-runhcs-v1/rootfs.go

@@ -59,7 +59,7 @@ func parseLegacyRootfsMount(m *types.Mount) (string, []string, error) {
 	containerdMount := mount.Mount{Type: m.Type, Source: m.Source, Target: m.Target, Options: m.Options}
 	parentLayerPaths, err := containerdMount.GetParentPaths()
 	if err != nil {
-		return "", nil, fmt.Errorf("unmarshal parent layer paths from mount: %v: %w", err, errdefs.ErrFailedPrecondition)
+		return "", nil, fmt.Errorf("failed to get mount's parent layer paths: %v: %w", err, errdefs.ErrFailedPrecondition)
 	}
 	return m.Source, parentLayerPaths, nil
 }