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: drive.go
    path of file: ./repos/rclone/backend/drive
    
    the code of the file until where you have to start completion: // Package drive interfaces with the Google Drive object storage system
package drive

// FIXME need to deal with some corner
    
func (f *Fs) getFileFields(ctx context.Context) (fields googleapi.Field) {
	fields = partialFields
	if f.opt.AuthOwnerOnly {
		fields += ",owners"
	}
	if f.opt.UseSharedDate {
		fields += ",sharedWithMeTime"
	}
	if f.opt.SkipChecksumGphotos {
		fields += ",spaces"
	}
	if f.opt.SizeAsQuota {
		fields += ",quotaBytesUsed"
	}
	if fs.GetConfig(ctx).Metadata {
		fields += "," + metadataFields
	}
	return fields
}