Is there any way I can use the picker to select a file from arbitrary location and then save the file to the containing folder

Question

Now I use the file picker to select a file. But I want to store the file to the same folder that containing this file. Is there any method to achieve this. Because I don't find any way that I can use interface IStorageFile of picked file to get its containing folder's IStorageFolder interface. Or it is not legal??