Which snippet of code acquire more locks

mutex.go

package main

import (
	"fmt"
	"sync"
	"time"
)

func main() {
	var mu sync.Mutex
  // A
	go (func() {
		var count int
		n := time.Now()
		for time.Since(n) < time.Second {
			mu.Lock()
			time.Sleep(2 * time.Nanosecond)
			mu.Unlock()
			count++
		}

		fmt.Println("Acquired lock", count)

	})()

  // B
	go (func() {
		var count int
		n := time.Now()
		for time.Since(n) < time.Second {
			mu.Lock()
			time.Sleep(time.Nanosecond)
			mu.Unlock()
			mu.Lock()
			time.Sleep(time.Nanosecond)
			mu.Unlock()
			count++
		}
		fmt.Println("acquired lock", count)
	})()
	time.Sleep(4*time.Second)

}