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: changes_other.go
    path of file: ./repos/devspace/vendor/github.com/docker/docker/pkg/archive
    
    the code of the file until where you have to start completion: //go:build !linux
// +build !linux

package archive // import "github.com/docker/docker/pkg/archive"

import (
	"fmt"
	"os"
	"path/filepath"
	"runtime"
	"strings"

	"github.com/docker/docker/pkg/system"
)

func collectFileInfoForChanges(oldDir, newDir string) (*FileInfo, *FileInfo, error) {
	var (
		oldRoot, newRoot *FileInfo
		err1, err2       error
		errs             = make(chan error, 2)
	)
	go func() {
		oldRoot, err1 = collectFileInfo(oldDir)
		errs <- err1
	}()
	go func() {
		newRoot, err2 = collectFileInfo(newDir)
		errs <- err2
	}()

	// block until both routines have returned
	for i := 0; i < 2; i++ {
		if err := <-errs; err != nil {
			return nil, nil, err
		}
	}

	return oldRoot, newRoot, nil
}

func collectFileInfo(sourceDir string) (*FileInfo, error) {
	root := newRootFileInfo()

	err := filepath.Walk(sourceDir, func(path string, f os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Rebase path
		relPath, err := filepath.Rel(sourceDir, path)
		if err != nil {
			return err
		}

		// As this runs on the daemon side, file paths are OS specific.
		relPath = filepath.Join(string(os.PathSeparator), relPath)

		// See https://gi
    
func collectFileInfo(sourceDir string) (*FileInfo, error) {
	root := newRootFileInfo()

	err := filepath.Walk(sourceDir, func(path string, f os.FileInfo, err error) error {
		if err != nil {
			return err
		}

		// Rebase path
		relPath, err := filepath.Rel(sourceDir, path)
		if err != nil {
			return err
		}

		// As this runs on the daemon side, file paths are OS specific.
		relPath = filepath.Join(string(os.PathSeparator), relPath)

		// See https://github.com/golang/go/issues/9168 - bug in filepath.Join.
		// Temporary workaround. If the returned path starts with two backslashes,
		// trim it down to a single backslash. Only relevant on Windows.
		if runtime.GOOS == "windows" {
			if strings.HasPrefix(relPath, `\\`) {
				relPath = relPath[1:]
			}
		}

		if relPath == string(os.PathSeparator) {
			return nil
		}

		parent := root.LookUp(filepath.Dir(relPath))
		if parent == nil {
			return fmt.Errorf("collectFileInfo: Unexpectedly no parent for %s", relPath)
		}

		info := &FileInfo{
			name:     filepath.Base(relPath),
			children: make(map[string]*FileInfo),
			parent:   parent,
		}

		s, err := system.Lstat(path)
		if err != nil {
			return err
		}
		info.stat = s

		info.capability, _ = system.Lgetxattr(path, "security.capability")

		parent.children[info.name] = info

		return nil
	})
	if err != nil {
		return nil, err
	}
	return root, nil
}