[stunnel-users] Help needed to load hierarchical chain of certificates

Help needed to load hierarchical chain of certificates(Root, CA) when stunnel running in server mode. We are trying to load. but only server signed certificate is loading which is assigned in cert as below,

CAfile=/u01/stunnel/AMEX_all/CA.PEM

cert=/u01/stunnel/AMEX_all/cert.pem

HOW TO LOAD HIERARCHICAL CHAIN OF CERTIFICATES?