Go如何cancel掉WithValue()的context

package main

import (
    "context"
    "fmt"
    "time"
)

func main() {
    //ctx, cancel := context.WithCancel(context.Background())
    ctx, _ := context.WithTimeout(context.Background(), 3 * time.Second)
    //ctx := context.WithValue(context.Background(), "huhu", "ssssss")
    go HandleRequest(ctx)

    time.Sleep(10 * time.Second)
    //cancel()
}

func HandleRequest(ctx context.Context) {
    go WriteDatabase(context.WithValue(ctx, "huhu", "hhhhh"))
    for {
        select {
        default:
            fmt.Println("HandleRequest running", ctx.Value("huhu"))    
        case <-ctx.Done():
            fmt.Println("HandleRquest Done")
            return
        }
    }
}

func WriteDatabase(ctx context.Context) {
    for {
        select {
        default:
            fmt.Println("WriteDatabase running", ctx.Value("huhu"))
        case <-ctx.Done():
            fmt.Println("WriteDatabase Done")
            return
        }
    }
}