title: Get the most precise time in Ruby
body: <p>I want to get the most possible precis time using Ruby.  For example:</p>
  
  <pre><code>3.times.map do 
    Thread.new do
      # Expect 3 differnt results from each thread
      p Time.now.precis_time
    end
  end.each(&amp;:join)
  </code></pre>
  
  <p>However, even using the <a href="http://ruby-doc.org/core-2.3.4/Time.html#method-i-strftime" rel="nofollow noreferrer">strftime</a>, I still can not achieve the goal. So is there any other way to get this?</p>