code: public void setParentPath(com.google.api.ads.admanager.axis.v201902.AdUnitParent[] parentPath) {
          this.parentPath = parentPath;
      }
docs: Sets the parentPath value for this AdUnit.
  
  @param parentPath   * The path to this ad unit in the ad unit hierarchy represented
  as a list from the root to this
  ad unit's parent. For root ad units, this list is
  empty. This attribute is read-only and is
  populated by Google.