Fraction of non-prompt \jpsi mesons, $f_{\rm B}$, for $\pt>1$ \GeVc as a function of the self-normalized charged-particle multiplicity measured within $|\eta|0.9$ for the INEL$>$0 (full markers) and V0M 0--0.1\% (open markers) event classes. The vertical bars and boxes indicate the statistical and systematic uncertainties, respectively. The results are compared to PYTHIA 8 simulations using different tunes, as indicated by the legend . The PYTHIA calculations emulating the V0M 0--0.1\% class (0.1\% highest multiplicity events in the V0 acceptance) are shown as hashed lines.