还是关于json.Marshal的问题

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```go // The Go visibility rules for struct fields are amended for JSON when // deciding which field to marshal or unmarshal. If there are // multiple fields at the same level, and that level is the least // nested (and would therefore be the nesting level selected by the // usual Go rules), the following extra rules apply: // // 1) Of those fields, if any are JSON-tagged, only tagged fields are considered, // even if there are multiple untagged fields that would otherwise conflict. // // 2) If there is exactly one field (tagged or not according to the first rule), that is selected. // // 3) Otherwise there are multiple fields, and all are ignored; no error occurs. // ``` 其中的`the least nested`最小嵌套是什么意思?这里的A,B,C三个struct哪个是最小嵌套? ```go type Int int type C struct { Int } type B struct { C Int } type A struct { B Int } ```

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