go pprof中的“持续时间:30.18s,总样本= 26.26s(87.00%)”是什么意思?

As my understanding, pprof stops and samples go program at every 10ms. So a 30s program should got 3000 samples, but what’s the meaning of the 26.26s? How can the samples count be shown as time duration?

What’s more, I even ever got such output shows that the sample time is bigger than wall time, how could it be such result?

Duration: 5.13s, Total samples = 5.57s (108.58%)