I am trying to understand what a fractional second is. I found a fractional second,here:

double uhd::time_spec_t::get_frac_secs  (   void        )    const
     Get the fractional part of the time in seconds.

Returns:
     the fractional seconds

What exactly is a fractional second represented as a double? Can someone give me an example value and how that translates in to seconds?

date time double
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