1. A method of identifying metadata referenced by a target quota tree, the method comprising: accessing a quota tree metafile that includes a reference to a location of an inode grouped data structure for each of a plurality of quota trees in a file system, wherein each of the inode grouped data structures stores (i) a set of inode identifiers that includes an inode identifier for each data container associated with the inode grouped data structure's corresponding quota tree, and (ii) a separately indexed metadata entry for each of the inode identifiers in the set; identifying, from the quota tree metafile, the reference to the location of the inode grouped data structure for the target quota tree, wherein the target quota tree is one of the plurality of quota trees in the file system; accessing the inode grouped data structure based on the reference; and locating the metadata referenced by the target quota tree using at least one of the inode identifiers from the set of inode identifiers as an index for the separately indexed metadata entries.