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tv_nsec 

        # Time.tv_nsec

(from ruby core)
---
    time.nsec    -> int
    time.tv_nsec -> int

---

Returns the number of nanoseconds for the subsecond part of *time*. The
result is a non-negative integer less than 10**9.

    t = Time.now        #=> 2020-07-20 22:07:10.963933942 +0900
    t.nsec              #=> 963933942

If *time* has fraction of nanosecond (such as picoseconds), it is
truncated.

    t = Time.new(2000,1,1,0,0,0.666_777_888_999r)
    t.nsec              #=> 666777888

Time#subsec can be used to obtain the subsecond part exactly.

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