GOLANG:exclude trash files from google drive

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type listAllFilesArgs struct {
	query     string
	fields    []googleapi.Field
	sortOrder string
	maxFiles  int64
}
type Field string

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func (self *Drive) listAllFiles(args listAllFilesArgs) ([]*drive.File, error) {
	var files []*drive.File
	var pageSize int64
	if args.maxFiles > 0 && args.maxFiles < 1000 {
		pageSize = args.maxFiles
	} else {
		pageSize = 1000
	}
	controlledStop := fmt.Errorf("Controlled stop")
	err := self.service.Files.List().Q(args.query).Fields(args.fields...).OrderBy(args.sortOrder).PageSize(pageSize).Pages(context.TODO(), func(fl *drive.FileList) error {
		files = append(files, fl.Files...)

		// Stop when we have all the files we need
		if args.maxFiles > 0 && len(files) >= int(args.maxFiles) {
			return controlledStop
		}

		return nil
	})

	if err != nil && err != controlledStop {
		return nil, err
	}

	if args.maxFiles > 0 {
		n := min(len(files), int(args.maxFiles))
		return files[:n], nil
	}

	return files, nil
}

func (self *Drive) newPathfinder() *remotePathfinder {
	return &remotePathfinder{
		service: self.service.Files,
		files:   make(map[string]*drive.File),
	}
}

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i am using go for my googledrive api development following wre the details of version usage,
go version go1.8.1 windows/amd64
and imported
"google.golang.org/api/drive/v3"
"google.golang.org/api/googleapi"
for development

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err = gDrive.List(listArgs)
	if err != nil {
		fmt.Errorf("Failed to list files: %s", err)
	}

func (self *Drive) List(args ListFilesArgs) (err error) {
	listArgs := listAllFilesArgs{
		query:     args.Query,
		fields:    []googleapi.Field{"nextPageToken", "files(id,name,md5Checksum,mimeType,size,createdTime,parents)"},
		sortOrder: args.SortOrder,
		maxFiles:  args.MaxFiles,
	}
	files, err := self.listAllFiles(listArgs)
	if err != nil {
		return fmt.Errorf("Failed to list files: %s /n", err)
	}

	pathfinder := self.newPathfinder()

	if args.AbsPath {
		// Replace name with absolute path
		for _, f := range files {
			f.Name, err = pathfinder.absPath(f)
			if err != nil {
				return err
			}
		}
	}

	PrintFileList(PrintFileListArgs{
		Out:         args.Out,
		Files:       files,
		NameWidth:   int(args.NameWidth),
		SkipHeader:  args.SkipHeader,
		SizeInBytes: args.SizeInBytes,
	})

	return
}

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google drive api for Golang listing files including trash.
How to exclude trash files,

To filter files that you want to retrieve from google drive, you need to specify search parameters as described in "Search for Files". Pass it as the argument of Q(...), for example

> Suppose you want to search for pdf file with a name containing myfile and not in trashed.

then the code will look like

err := self.service.Files.List().
   Q("mimeType='application/pdf' and name contains 'myfile' and trashed=false")