/// <summary>
/// Gets the parent folder of a given file system resource.
/// </summary>
/// <param name="childFilePath">The qualified path (<see cref="VirtualResourceInfo.FullName"/>
/// of a file that is used to resolve the parent folder.</param>
/// <returns>The parent of the file.</returns>
/// <exception cref="ArgumentNullException">If <paramref name="childFilePath"/>
/// is a null reference.</exception>
/// <exception cref="VirtualResourceNotFoundException">If the file that is represented
/// by <paramref name="childFilePath"/> does not exist in the file system.</exception>
/// <exception cref="ResourceAccessException">In case of an invalid or prohibited
/// resource access.</exception>
public override VirtualFolderInfo GetFileParent(string childFilePath)
{
return(SecureFunc(FileSystemTask.FileParentRequest, () => OperationService.GetFileParent(childFilePath),
() => String.Format("Could not get meta data about parent folder of file [{0}].", childFilePath)));
}