How get nested vc enum class code element's container vc class code element

Recently, I was working on my visual studio package using VCCodeModel for automation. However, I want to get a nested vc enum class's container vc class, but I found that the VCCodeEnum's parent is a object of VCCodeNamespace. How could I get  its container class code element.

The following is the step I were trying to access the container code element.
VC target code:

namespace NS{
    class Container{
        enum class Nested{
            A,
            B};};}

C# code behind:

Firstly, set cursor inside the nested enum class,  get current TextPoint from active document.

Secondly, get CodeElement from TextPoint which returns a VCCodeEnum (Nested) or VCCodeVariable (A or B) (call parent to get VCCodeEnum (Nested)).

Thirdly, call the VCCodeEnum's parent to get the direct parent but finally return a VCCodeNamespace object (NS).

Precondition=>set cursor inside a nested enum class (Nested)

Purpose=>get container code element (NS)

If the current design builtin API for CodeElement is able to  access nested CodeElement's container CodeElement, what should I do? If not, any other solutions?

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