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We present the detection of a bright radio burst at radio frequencies between2.2--2.3 GHz with the NASA Deep Space Network (DSN) 70 m dish (DSS-63) inMadrid, Spain from FRB~20200120E. This repeating fast radio burst (FRB) wasrecently discovered by the Canadian Hydrogen Intensity Mapping Experiment FastRadio Burst (CHIME/FRB) instrument and reported to be associated with the M81spiral galaxy at a distance of 3.6 Mpc. The high time resolution capabilitiesof the recording system used in this observation, together with the smallamount of scattering and intrinsic brightness of the burst, allow us to explorethe burst structure in unprecedented detail. We find that the burst has aduration of roughly 30 $\mu$s and is comprised of several narrow componentswith typical separations of 2--3 $\mu$s. The narrowest component has a width of$\lesssim$ 100 ns, which corresponds to a light travel time size as small as 30m, the smallest associated with an FRB to date. The peak flux density of thenarrowest burst component is 270 Jy. We estimate the total spectral luminosityof the narrowest component of the burst to be 4 $\times$ 10$^{\text{30}}$ ergs$^{\text{-1}}$ Hz$^{\text{-1}}$, which is a factor of $\sim$500 above theluminosities of the so-called "nanoshots" associated with giant pulses from theCrab pulsar. This spectral luminosity is also higher than that of the radiobursts detected from the Galactic magnetar SGR 1935+2154 during its outburst inApril 2020, but it falls on the low-end of the currently measured luminositydistribution of extragalatic FRBs. These results provide further support forthe presence of a continuum of FRB burst luminosities.

A Bright Fast Radio Burst from FRB 20200120E with Sub-100-Nanosecond Structure