/usr/share/man/man3/smiGetFirstNode.3.gz is in libsmi2-dev 0.4.8+dfsg2-10+b2.
This file is owned by root:root, with mode 0o777.
It is a symlink to /usr/share/man/man3/smi_node.3.gz
/usr/share/man/man3/smi_node.3.gz