1. A method of enabling file system tagging by an application, comprising: creating tag associations for the file system in a storage device, comprising: associating at least one tag with a file object of the file system in the storage device, comprising: allocating a file association structure in the storage device, the file allocation structure having attributes including a pointer to a file handle of the file object and a list of names of tags associated with the file object; and for each tag in the file system, allocating a tag structure, the tag structure comprising: a name of the tag; and a list of file associations for the tag, the list specifying a linked list of file association objects defined by the file association structure; and in response to receiving a system call from the application, the system call including a request for a read directory operation on the file system, performing: retrieving the tag associations from the storage device to identify the file object; dynamically assembling a directory entry structure that includes a hierarchical view of tags identified from the tag associations and corresponding file object; and returning the directory entry structure to the application.