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: archive_110.go
    path of file: ./repos/octant/vendor/github.com/containers/storage/pkg/archive
    
    the code of the file until where you have to start completion: // +build go1.10

package archive

import (
	"archive/tar"
	"time"
)

func copyPassHeader(hdr *tar.Header) {
	hdr.Format = tar.FormatPAX
}

func maybeTruncateHeaderModTime(hdr *tar.Header) {
	if hdr.Format == tar.F
    
func maybeTruncateHeaderModTime(hdr *tar.Header) {
	if hdr.Format == tar.FormatUnknown {
		// one of the first things archive/tar does is round this
		// value, possibly up, if the format isn't specified, while we
		// are much better equipped to handle truncation when scanning
		// for changes between source and an extracted copy of this
		hdr.ModTime = hdr.ModTime.Truncate(time.Second)
	}
}