Provide a documentation on how to provide views integration for base fields

Let first start with an exemple for a datetime field used in a BankOperation entity which should store bank operation data
=>I need help to extends properly EntityViewsData

1-The base field is created as follow in the
modules/custom/bank_operation/src/Entity/BankOperation.php

Notes:
a- The views_data key is pointing to a class which will be created in step 2
b- The operation_date base field have the datetime type

 * @ContentEntityType(
 *   id = "bank_operation",
 ...
 *     "views_data" = "Drupal\bank_operation\BankOperationViewsData",
 ...
class BankOperation extends ContentEntityBase implements BankOperationInterface {

  public static function baseFieldDefinitions(EntityTypeInterface $entity_type) {
    ...
    $fields['operation_date'] = BaseFieldDefinition::create('datetime')
      ->setLabel(t("Operation date"))
      ->setRequired(TRUE)
      ->setSettings([
        'datetime_type' => DateTimeItem::DATETIME_TYPE_DATE,
      ])
    ...
}

2- To integrate with Views we must extends and use our own EntityViewsData class (mandatory until #2337515: Allow @FieldType to customize views data is landed)
Extract from modules/custom/bank_operation/src/BankOperationViewsData.php:
Note:
This class is created according to the value of the views_data key used in the entity annotation.

class BankOperationViewsData extends EntityViewsData {

  public function getViewsData() {
    $data = parent::getViewsData();
    $data['bank_operation']['operation_date']['filter'] = [
       // I nee help to handle this
    ];
    return $data;
  }

}