GrepDirectory[
PacletFind["PacletManager"][[1]]["Location"],
"FunctionInformation"
]
{"/Applications/Mathematica.app/Contents/SystemFiles/Autoload/PacletManager/\
Kernel/Paclet.m", \
"/Applications/Mathematica.app/Contents/SystemFiles/Autoload/PacletManager/\
Kernel/Manager.m"}