code: public ClassInfoList getInterfaces() {
          return filter(new ClassInfoFilter() {
              @Override
              public boolean accept(final ClassInfo ci) {
                  return ci.isInterface();
              }
          });
      }
docs: Filter this {@link ClassInfoList} to include only interfaces that are not annotations. See also
  {@link #getInterfacesAndAnnotations()}.
  
  @return The filtered list, containing only interfaces.