Десериализация дерева нод из JSON

type I3Node struct {
        Id     int
        Name   string
        Type   string
        Nodes  []I3Node
        Parent *I3Node `json:"-"`
}

func Decode(r io.Reader) (v I3Node) {
        json.NewDecoder(r).Decode(&v)
        for i, n := range v.Nodes {
                n.Parent = &v
                v.Nodes[i] = n
        }
        return
}

func (self *I3Node) SetParent(parent *I3Node) {

	self.Parent = parent

	if self.Parent != nil {
		fmt.Println("My ID", self.Id, "Parent ID", self.Parent.Id)
	} else {
		fmt.Println("Root node", self.Id)
	}

	for _, node := range self.Nodes {
		node.SetParent(self)
	}
	for _, node := range self.Floating_Nodes {
		node.SetParent(self)
	}
}

func (self *IPCSocket) GetTree() (root I3Node, err error) {
	...
	err = json.Unmarshal(json_reply, &root)
	root.SetParent(nil)
	fmt.Printf("%#v\n", root)
	...
}

	...
	My ID 36316976 Parent ID 36317344
	My ID 36317344 Parent ID 36316608
	My ID 36316608 Parent ID 35145920
	My ID 35145920 Parent ID 35144864
	My ID 35153056 Parent ID 35144864
	My ID 35144864 Parent ID 35139792
	Root node 35139792

	Далее вывод fmt.Printf("%#v\n", root),
	в котором видно, что во всех нодах
        Parent == nil (Parent:(*i3ipc.I3Node)(nil))

{
  "id": 1,
  "name": "root",
  "nodes": [
    {
      "id": 2,
      "name": "first",
      "nodes": [
      
      ]
    },
    {
      "id": 3,
      "name": "second",
      "nodes": [
        {
          "id": 4,
          "name": "third",
          "nodes": []
        },
        {
          "id": 5,
          "name": "fourth",
          "nodes": []
        },
      ]
    }
  ]
}

Root node 1
My ID 2 Parent ID 1
My ID 3 Parent ID 1
My ID 4 Parent ID 3
My ID 5 Parent ID 3
main.I3Node{Id:1, Name:"root", Floating_Nodes:[]main.I3Node(nil), Nodes:[]main.I3Node{main.I3Node{Id:2, Name:"first", Floating_Nodes:[]main.I3Node(nil), Nodes:[]main.I3Node{}, Parent:(*main.I3Node)(nil)}, main.I3Node{Id:3, Name:"second", Floating_Nodes:[]main.I3Node(nil), Nodes:[]main.I3Node{main.I3Node{Id:4, Name:"third", Floating_Nodes:[]main.I3Node(nil), Nodes:[]main.I3Node{}, Parent:(*main.I3Node)(nil)}, main.I3Node{Id:5, Name:"fourth", Floating_Nodes:[]main.I3Node(nil), Nodes:[]main.I3Node{}, Parent:(*main.I3Node)(nil)}}, Parent:(*main.I3Node)(nil)}}, Parent:(*main.I3Node)(nil)}