If you wish to use the output of the "File System Snapshot" step in part only, so as to exclude the file permissions, then you will need to write a filter or custom step to do this.
There is, however, an alternative. Have you considered the use of the "Load a Set of File Names" dataset that can be added to a step. Using this dataset, one may retrieve the file names from a directory one-at-a-time for later use. The path to the file is returned. These could be written to a file using the Write Properties to a File" step, if you choose, or simply processed in turn.