Unless expressly provided otherwise in a written employment agreement, the creation of an attorney-client relationship between a lawyer and a person serving as a fiduciary shall not impose upon the lawyer any duties or obligations to other persons interested in the estate, trust estate, or other fiduciary property, even though fiduciary funds may be used to compensate the lawyer for legal services rendered to the fiduciary. This section is intended to be declaratory of the common law and governs relationships in existence between lawyers and persons serving as fiduciaries as well as such relationships hereafter created.