Joining two dataframes of different length with different values

Yo!
So basically I have two dataframes with similar data. They both have a time stamp, although one is at higher temporal resolution. To be clear, the values from one set increment by 1s, while the other set increments by .001s.
df1 = data.frame( seq(from = 0, to =10, by = 1) )
df2 = data.frame( seq(from = 0, to =10, by = 0.001) )

I thought I could filter out the rows that don't exist in df1 from df2 by using %in%
df2 = df2[df2[1] %in% df1[1],]

but it is returning an empty data frame

Is there an easy solution to this?

Are you after something like an inner join?

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