timestamp__scnprintf_nsec
timestamp__scnprintf_nsec(res_samples[i].time, tbuf, sizeof tbuf);
n = timestamp__scnprintf_nsec(r->time - context_len, trange, sizeof trange);
timestamp__scnprintf_nsec(r->time + context_len, trange + n, sizeof trange - n);
timestamp__scnprintf_nsec(r->time, tsample, sizeof tsample);
timestamp__scnprintf_nsec(he->time, he_time,
int timestamp__scnprintf_nsec(u64 timestamp, char *buf, size_t sz);