code: public CodeSigner[] getCodeSigners() {
          final SecurityManager sm = System.getSecurityManager();
          if (sm != null) {
              sm.checkPermission(new VirtualFilePermission(getPathName(), "read"));
          }
          final VFS.Mount mount = VFS.getMount(this);
          return mount.getFileSystem().getCodeSigners(mount.getMountPoint(), this);
      }
docs: Get the {@link CodeSigner}s for a the virtual file.
  
  @return the {@link CodeSigner}s for the virtual file, or {@code null} if not signed