Signed-off-by: Anton Nikiforov <an.nikiforov@yadro.com>

@@ -468,0 +485,4 @@
+		state:     ni.state,
+	}
+	for _, v := range ni.attributes {
+		dst.attributes = append(dst.attributes, *v.Clone())

@@ -99,0 +102,4 @@
+		epoch: x.epoch,
+	}
+	for _, node := range x.nodes {
+		dst.nodes = append(dst.nodes, *node.Clone())

@@ -48,0 +54,4 @@
+
+	c := nm.Clone()
+
+	require.True(t, c != nm)

@@ -382,6 +385,15 @@ func (a *Attribute) SetParents(parent []string) {
 	a.parents = parent
 }
 
+// Clone returns a copy of Attribute.