How to use the strapi-utils.sanitizeEntity function in strapi-utils

const sanitizeUser = user =>
  sanitizeEntity(user, {
    model: strapi.query('user', 'users-permissions').model,
  });

async findOne(ctx) {
      const entity = await service.findOne(ctx.params);
      return sanitizeEntity(entity, { model });
    },

async update(ctx) {
      let entity;
      if (ctx.is('multipart')) {
        const { data, files } = parseMultipartData(ctx);
        entity = await service.update(ctx.params, data, { files });
      } else {
        entity = await service.update(ctx.params, ctx.request.body);
      }

      return sanitizeEntity(entity, { model });
    },