Editor\InspectorSkipInheritanceAttributeEditor.cs

using UnityEngine;

namespace FullInspector.Modules.Attributes {
    [CustomAttributePropertyEditor(typeof(InspectorSkipInheritanceAttribute), ReplaceOthers = true)]
    public class InspectorSkipInheritanceAttributeEditor<T> : AttributePropertyEditor<T, InspectorSkipInheritanceAttribute> {

        private static IPropertyEditor GetEditor(object element) {
            if (element == null) {
                return PropertyEditor.Get(typeof(T), null).FirstEditor;
            }
            return PropertyEditor.Get(element.GetType(), null).FirstEditor;
        }

        protected override T Edit(Rect region, GUIContent label, T element, InspectorSkipInheritanceAttribute attribute) {
            return GetEditor(element).Edit(region, label, element);
        }

        protected override float GetElementHeight(GUIContent label, T element, InspectorSkipInheritanceAttribute attribute) {
            return GetEditor(element).GetElementHeight(label, element);
        }

        public override GUIContent GetFoldoutHeader(GUIContent label, object element) {
            return GetEditor(element).GetFoldoutHeader(label, element);
        }

        protected override T OnSceneGUI(T element, InspectorSkipInheritanceAttribute attribute) {
            return GetEditor(element).OnSceneGUI(element);
        }
    }
}

InspectorSkipInheritanceAttribute.cs

using System;

namespace FullInspector {
    /// <summary>
    /// Adding [InspectorSkipInheritance] will prevent the drop-down type selection editor from
    /// being shown.
    /// </summary>
    [AttributeUsage(AttributeTargets.Field | AttributeTargets.Property)]
    public class InspectorSkipInheritanceAttribute : Attribute, IInspectorAttributeOrder {
        double IInspectorAttributeOrder.Order {
            get {
                return double.MinValue;
            }
        }
    }
}