* Processes allowed SIDs (Security Identifiers) and adds them to the SID set.
     * If the SID is a group, it recursively processes all group members.
     *
     * @param file the SMB1 file
     * @param sid the SID to process
     * @param sidSet the set of SIDs to add to
     */
    protected void processAllowedSIDs(final SmbFile file, final SID sid, final Set<SID> sidSet) {
        if (logger.isDebugEnabled()) {