public class Product
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }
    public bool IsAvailable { get; set; }

    public virtual ICollection<Product> ChildProducts { get; set; }
}

public class ProductDTO
{
    public int Id { get; set; }
    public string Name { get; set; }
    public decimal Price { get; set; }

    public virtual ICollection<Product> ChildProducts { get; set; }
}

public IQueryable<ProductDto> GetProductsDto()
{
    var products = ProductContext.DbSet.ProjectTo<PoductDto>();
    Logger.Debug($"{products.Count()}");
    return products.AsQueryable();
}

CreateMap<Product, ProductDto>()
             .ForMember(dest => dest.ChildProducts,
                 opt =>
                 {
                     opt.Condition(x => x.ChildProducts.Any(child => child.IsAvailable == true));
                 })
             .MaxDepth(1) //Set the Max Depth of Expands
             .PreserveReferences();