You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: mono.go
    path of file: ./repos/sliver/vendor/tailscale.com/tstime/mono
    
    the code of the file until where you have to start completion: // Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause

// Package m
    
func Now() Time {
	// On a newly started machine, the monotonic clock might be very near zero.
	// Thus mono.Time(0).Before(mono.Now.Add(-time.Minute)) might yield true.
	// The corresponding package time expression never does, if the wall clock is correct.
	// Preserve this correspondence by increasing the "base" monotonic clock by a fair amount.
	const baseOffset int64 = 1 << 55 // approximately 10,000 hours in nanoseconds
	return Time(int64(time.Since(baseWall)) + baseOffset)
}